Speed up shell startup: remove duplicate compinit, lazy-load pyenv/nvm

- Remove manual compinit in .zshrc (oh-my-zsh already handles it),
  eliminating a redundant ~350ms call
- Lazy-load pyenv init (~710ms) until first use, matching the existing
  kubectl lazy-load pattern
- Lazy-load nvm init for when it gets installed in the future

dot_oh-my-zsh/custom/tools/nvm.zsh

@@ -1,6 +1,14 @@
 # NVM (Node Version Manager) configuration
 # Auto-loaded by oh-my-zsh from $ZSH_CUSTOM/tools/
+# Lazy-loaded: defers nvm init until first use
 
 export NVM_DIR="$HOME/.nvm"
-[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
-[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"
+
+if [[ -s "$NVM_DIR/nvm.sh" ]]; then
+    function nvm() {
+        unfunction nvm
+        \. "$NVM_DIR/nvm.sh"
+        [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"
+        nvm "$@"
+    }
+fi

dot_oh-my-zsh/custom/tools/pyenv.zsh

@@ -1,11 +1,15 @@
-# Pyenv configuration
+# Pyenv configuration (lazy-loaded)
 # Auto-loaded by oh-my-zsh from $ZSH_CUSTOM/tools/
 
 export PYENV_ROOT="$HOME/.pyenv"
 [[ -d $PYENV_ROOT/bin ]] && export PATH="$PYENV_ROOT/bin:$PATH"
 
-if command -v pyenv >/dev/null 2>&1; then
-    eval "$(pyenv init - zsh)"
+if (( $+commands[pyenv] )); then
+    function pyenv() {
+        unfunction pyenv
+        eval "$(command pyenv init - zsh)"
+        pyenv "$@"
+    }
 fi
 
 # Virtualenvwrapper

dot_zshrc

@@ -1,13 +1,3 @@
-# ============================================================================
-# Fast compinit - cache completions, regenerate once daily
-# ============================================================================
-autoload -Uz compinit
-if [[ -n ${ZDOTDIR:-$HOME}/.zcompdump(#qN.mh+24) ]]; then
-  compinit
-else
-  compinit -C
-fi
-
 # ~/.zshrc - Zsh configuration for interactive shells
 # Customizations are in ~/.oh-my-zsh/custom/*.zsh (auto-loaded)